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首页> 美国卫生研究院文献>Polymers >Broadband Dielectric Spectroscopy: A Viable Technique for Aging Assessment of Low-Voltage Cable Insulation Used in Nuclear Power Plants
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Broadband Dielectric Spectroscopy: A Viable Technique for Aging Assessment of Low-Voltage Cable Insulation Used in Nuclear Power Plants

机译：宽带介质光谱：用于核电站低压电缆绝缘的老化评估的可行技术

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This paper deals with the study of a non-destructive technique to detect the aging state of cable insulation used in a nuclear environment subjected to radiation and temperature aging. Cable samples were aged under dose rates ranging from 0.42 and 1.06 kGy/h at 55 and 85 °C. The imaginary part of the permittivity at 100 kHz is found to correlate well with mechanical properties, such as elongation at break, which is typically used to diagnose cable insulation, but it is a destructive property and cannot be used on field. It has been demonstrated also that a post-irradiation effect occurs even years after aging is stopped, increasing the imaginary permittivity and worsening mechanical properties due to the slow conversion of radicals into oxidized species. The main consequence is that when cable insulation is subjected to a nuclear accident, releasing a huge amount of radiation, the health of cable insulation must be followed also for a long time after the accident occurred, since aging due to oxidation progresses even when the radiation source is switched off.
机译：本文涉及一种非破坏性技术的研究，以检测辐射和温度老化的核环境中使用的电缆绝缘老化状态。电缆样品在0.42和1.06 kgy / h的剂量率下老化，55和85℃。发现100kHz的介电常数的虚部与机械性能良好，例如突破的伸长率，这通常用于诊断电缆绝缘，但它是一个破坏性的属性，不能在现场使用。还证明了在停止衰老后甚至几年后发生的辐照效果，由于自由基转化为氧化物质，增加了假想介收性和恶化的力学性能。主要结果是，当电缆绝缘经受核事故时，释放大量辐射时，在发生事故发生后，必须遵循电缆绝缘的健康，因为氧化引起的老化即使辐射也会进展源已关闭。

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